From: Takashi Iwai <tiwai@suse.de>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Jean-Francois Moine <moinejf@free.fr>,
alsa-devel@alsa-project.org, Lars-Peter Clausen <lars@metafoo.de>,
Philipp Zabel <p.zabel@pengutronix.de>,
Arnaud Pouliquen <arnaud.pouliquen@st.com>,
Koro Chen <koro.chen@mediatek.com>, Jyri Sarha <jsarha@ti.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
linux-mediatek@lists.infradead.org,
Daniel Kurtz <djkurtz@chromium.org>,
kernel@pengutronix.de, Matthias Brugger <matthias.bgg@gmail.com>,
Cawa Cheng <cawa.cheng@mediatek.com>
Subject: Re: [RFC v2 6/6] ASoC: hdmi-codec: Use HDMI notifications to add jack support
Date: Fri, 08 Jan 2016 11:52:40 +0100 [thread overview]
Message-ID: <s5h1t9sfimf.wl-tiwai@suse.de> (raw)
In-Reply-To: <20160108104623.GF19062@n2100.arm.linux.org.uk>
On Fri, 08 Jan 2016 11:46:23 +0100,
Russell King - ARM Linux wrote:
>
> Given that, I'd like to throw in here another detail: iirc, i915's
> HDMI exports the ELD to userspace via a control called "ELD" - see
> eld_bytes_ctl in sound/pci/hda/patch_hdmi.c. This allows userspace
> to monitor, and read the ELD including which compressed audio formats
> are supported. I'm not currently aware of anything that makes use of
> this, but as there is this precedent for exporting this information,
> maybe it should become a standard way, so that video playback
> applications can then select an appropriate audio stream depending on
> the current properties of the connected device?
Right, the ELD ctl elements were introduced exactly for such a
purpose. Though, I'm not sure currently which user-space app is
actually referring to this information, too. But certainly it's a
good thing to have for other drivers.
Takashi
next prev parent reply other threads:[~2016-01-08 10:52 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-04 19:09 [RFC v2 0/6] ASoC: Add mediatek HDMI codec support Philipp Zabel
2016-01-04 19:09 ` [RFC v2 1/6] drm/mediatek: hdmi: Add audio interface to the hdmi-codec driver Philipp Zabel
2016-01-04 22:29 ` Russell King - ARM Linux
2016-01-05 14:56 ` Philipp Zabel
[not found] ` <1451934551-21333-1-git-send-email-p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2016-01-04 19:09 ` [RFC v2 2/6] ASoC: mediatek: address dai link array entries by enum Philipp Zabel
2016-01-04 19:15 ` [RFC v2 3/6] ASoC: mediatek: Add HDMI dai-links in the machine driver Philipp Zabel
2016-01-05 12:46 ` Mark Brown
2016-01-07 10:06 ` Philipp Zabel
2016-03-05 12:24 ` Applied "ASoC: mediatek: address dai link array entries by enum" to the asoc tree Mark Brown
2016-01-04 19:19 ` [RFC v2 6/6] ASoC: hdmi-codec: Use HDMI notifications to add jack support Philipp Zabel
2016-01-07 17:09 ` Jyri Sarha
2016-01-08 8:43 ` Philipp Zabel
2016-01-08 9:57 ` Jyri Sarha
2016-01-08 10:46 ` Russell King - ARM Linux
2016-01-08 10:52 ` Takashi Iwai [this message]
2016-01-08 12:55 ` Mark Brown
2016-01-04 19:11 ` [RFC v2 0/6] ASoC: Add mediatek HDMI codec support Russell King - ARM Linux
2016-01-04 19:18 ` [RFC v2 4/6] video: rmk's HDMI notification prototype Philipp Zabel
2016-01-04 19:18 ` [RFC v2 5/6] drm/mediatek: hdmi: issue notifications Philipp Zabel
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